SHELL TYPE DOUBLE LEAF GATE TO WITHSTAND WAVE FORCES

Abstract

Two methods are established to provide resistance against wave forces to the shell type double leaf gate which is often installed in salinity barriers located in the vicinity of a river estuary. One is the double leaf gate in reverse arrangement and another is the ordinary arrangement with a truss type gate bottom. The latter has been in operation for more than 15 years at the Yodo River Great Barrier whose gate spans are amongst the largest in Japan. This paper includes an explanation of how to reduce the hydraulic downward force which may act on the reverse arrangement gate and analyses the wave energy dissipation mechanisms and the structural behavior of a gate having a truss type gate bottom.